During counselling, you have to produce all the necessary documents from your admit card to score card along with other documents like your category certificate. Even the economically weaker sections candidates (EWS) will have to submit their category certificate, along with the income certificate most of the times. So unless you qualify the eligibility criteria of EWS, can produce relevant documents, and information matches on all the documents at the time of counselling, you can not change any information. Doing so risks your admission.